Collapsible core for hollow concrete walls



E. J. EDDY.

COLLAPSLBLE CORE FOR HOLLOW CONCRETE WALLS.

'APPLICATION FILED AuG.2. 1921.

1,439,439 Patented Sept. 26, i922.

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stares EDWIN JAJEES EDDY, OF OTAHUI-IU, -AUCI{LAND, yl\l'l}"\l]' ZEALAND.

COLLAPSIBLE CORE'EOR HOLLOW CONCRETE WALLS.

Application filed August 2, 1921. Serial No. 489,225.

To @ZZ whom t may concern:

Be it known that EnwN James EDDY, citizen of the Dominion of New Zealand, residing at Favona Road, Mangere, Otahuhu, in the Provincial District of Auckland, has invented certain new and useful improvements in Collapsible Cores for Hollow Concrete Vilalls, of which the following is a specification.

This invention relates to cores used in the formation of hollow concrete walls, and has for its object the provision of an improved core capable of being easily placed in position, and which is also readily collapsed and removed,l` as the moulded concrete sets.

According to the invention, the core is formed with two separate sides of suitable dimensions adapt-ed to be kept apart the required distance by adjustable means so that when placed in position in the wall boxing or mould, spaces of the desired width are provided at each side of the core between the latter and the wall boxing, for moulding the outer and inner thicknesses or shells of the wall.

Each side of the core has hinged to the inside of each end one or more Avertical pieces adapted to fold inwards, the vertical pieces hinged to the same side being the same shape.

The shape of the vertical pieces hinged to the core sides, is such that both of the pieces attached to one side must be turned inwards to permit said side to be moved towards the other core side when it is desired to remove the core. After one core side has been removed the removal of the other side in a similar manner is a comparatively simple matter.

The means for keeping the core sides apart during the moulding of the wall, comprise horizontal plates, hinged at one end to the core side last removed from the mould, and provided with holes adapted to pass upon screwed studs projecting from the sides of the vertical pieces attached to the other core side, and facing each other. ling nuts screwing on said studs hold the plates on the studs during moulding operations.

Cover plates are also provided at the ends and top of the core for preventing the entrance of concrete between the sides thereof.

The invention will be furtherdescribed with reference' to the accompanying drawing, wherein Figure l shows the core in elevation.

Figure 2 is a sectional planV of same.

Figure 3 a vertical section and Figure 4 an end view, while y Figure 5 is an enlarged part sectional \0 plan showing one of the distance plates.

The'sides 1, 2 are made of wood, metal or the like and are of a size which permits them to be readily handled in setting up the core box and in removing same'from a wall in the course of or at the completion of the formation of the latter.

The side l has Vertical pieces 8 hinged to the inside of itsl ends, to' fold inwards, and the side 2 has vertical pieces i hinged to the inside of its ends, to also fold inwards.

The hinged vertical pieces 3, 4 are shaped so that when the core is set up in position in the wall mould or boxing, the piecese must be swung inwards before the pieces 3 can be swung inwards on their hinges. l

rl`he sides l, 2 are kept apart by horizontal plates 5 one or more at each end of the core, said plates 5 being` hinged at one end to the side l adjacent the vertical end pieces 3;

The plates are provided with holes 6 adapted to be passed upon screwed studs 7 provided with wing nuts 8, and which project horizontally from the sides of the ver- 'tical end pieces l facing each other, when said pieces l are in the position shown in the drawing.

By adjusting the plates 5 on the studs 7 the distance between the sides l and 2 can be increased or lessened, so as to regulate the spacesbetween the core sides and the wall boxing or mould in order to obtain inner and outer concrete shells of the desired thickness.

rihe ends of the sides l and 2 are curved 95 as shown andstop short of the pieces 3, 4, wiien the latter are opened out while in the lower edges of said sides, openings 9 are provided to allow oi' wall ties .being placed in position to unite the inner and outer shells of the wall.

rlhe vertical end pieces 3 have attached to their outer sides vertical plates 10, which when the pieces 3, l are in the positions shown cover and protect the Ijoints or spaces between said end pieces 3, 4 These plates 10 are not attached to the end pieces il.

ln use the core is erected with its sides l and 2 the required distance apart inside the boxing in which the wall is to be or is being formed. Wall ties are placed across the mould and are accommodated in the open ings 9.

The thuinb screws 8 hold the plates 5 securely on the studs l projecting troni the end pieces -l hinged to the side 2.

rl`he plates 5 being hinged at their other ends to the side l, the sides l and 2 are thereby rigidly held apart, with the end plates l0 covering` the joints or spaces be tween said end pieces 3 and 1l.

il cover 14 is pla-ced on the top of the core to prevent concrete from passing` downwards between the sides l and rl`his cover li has on its under side a strip ll which projects between and serves as a spreader to the sides l, 2, and also to the pieces 4l.

W hen the concrete has set sufficiently, the thuinbscrews 8 are renioved, and the plates 5 swung,` of? the studs 7, and back against the side l.

The vertical end pieces l can then be swung or folded inwards against the side E2, the sloped surfaces 12 and rounded outer corners of said pieces 4;, together with the sloped surfaces 13 of the pieces 3, making it necessary to swing` back the end pieces l before the end pieces 3. Following` on this the cover plates 10, are therefore secured only to the end pieces 3.

llVith the end pieces 4s swung or liolded back, sul'licient clearance is provided beH tween the side l and shell ol' the wall to permit the side Q, to be easily removed and once this is done ample working space is provided tor the removal of the side l.,

after the end pieces 3 and plates l0 have been swung` inwards.

lhat l do claiin and desire to obtain by `Letters Patent of the United States is:-

l. A collapsible core for hollow concrete walls, coinl'irising separate sides, hinged end pieces carried by each side, adapted to swinginwards, distance plates attached to one side, and studs on the hinged end pieces ot the other side adapted to engage the distance plate, substantially as described and illustrated.

2. collapsible core for hollow concrete walls according` to clairn l, wherein the distance plates hinged at one end to a side, and contains holes adapted to pass upon screwed studs,J provided with wing nuts, said studs projecting horizontally from the 'facing sides of end pieces substantially described and illustrated.

A collapsible core tor hollow concrete walls, according` to clairn l, wherein 'the hinged end pieces are shaped, so that the pieces hinged to one core side inust be swung inwards to permit the end pieces hinged to the other side to be swung inwards, substantially as described and illustrated.

l. l collapsible core for hollow concrete ll.l actordine` to claiin l, wherein the hinged end pieces, last swung inwards have attached thereto, vertical plates adapted to cover the joints or spaces between the end pieces of opposite sides, when the core is set up, substantially as described and illustrated.

fl. collapsible core for hollow concrete comprising separate sides, end pieces carried yby each side and mounted to swing thereon, distance plates attached to one side, and retaining` ineans carried by the end pieces of the other side adapted to engage said distance plates.

.ln testimony whereof l have ailixed rnv signature in presence of two vitnesses. 

